我想为每个列表项舍入imageView。我有这个代码来圆形图像：
public class RoundImage extends Drawable {
private final Bitmap mBitmap;
private final Paint mPaint;
private final RectF mRectF;
private final int mBitmapWidth;
private final int mBitmapHeight;
public RoundImage(Bitmap bitmap) {
mBitmap = bitmap;
mRectF = new RectF();
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
final BitmapShader shader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
mPaint.setShader(shader);
mBitmapWidth = mBitmap.getWidth();
mBitmapHeight = mBitmap.getHeight();
}
@Override
public void draw(Canvas canvas) {
canvas.drawOval(mRectF, mPaint);
}
@Override
protected void onBoundsChange(Rect bounds) {
super.onBoundsChange(bounds);
mRectF.set(bounds);
}
@Override
public void setAlpha(int alpha) {
if (mPaint.getAlpha() != alpha) {
mPaint.setAlpha(alpha);
invalidateSelf();
}
}
@Override
public void setColorFilter(ColorFilter cf) {
mPaint.setColorFilter(cf);
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
@Override
public int getIntrinsicWidth() {
return mBitmapWidth;
}
@Override
public int getIntrinsicHeight() {
return mBitmapHeight;
}
public void setAntiAlias(boolean aa) {
mPaint.setAntiAlias(aa);
invalidateSelf();
}
@Override
public void setFilterBitmap(boolean filter) {
mPaint.setFilterBitmap(filter);
invalidateSelf();
}
@Override
public void setDither(boolean dither) {
mPaint.setDither(dither);
invalidateSelf();
}
public Bitmap getBitmap() {
return mBitmap;
}
}
这是我的列表适配器代码，我正在尝试使用圆形图像功能，但我收到错误。
public class LazyAdapterConciCiudad extends BaseAdapter {
// Declare Variables
Context context;
LayoutInflater inflater;
ArrayList<HashMap<String, String>> data;
ImageLoader imageLoader;
HashMap<String, String> resultp = new HashMap<String, String>();
Typeface tf, tf_dos;
public LazyAdapterConciertosCiudad(Context context,
ArrayList<HashMap<String, String>> arraylist, String font, String font_dos) {
this.context = context;
data = arraylist;
imageLoader = new ImageLoader(context);
tf = Typeface.createFromAsset(context.getAssets(), font);
tf_dos = Typeface.createFromAsset(context.getAssets(), font_dos);
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// Declare Variables
TextView id_equipo;
ImageView escudo_local, escudo_visitante, icono_tv;
TextView equipo_local, equipo_visitante;
TextView canal_tv, jornada, dia_hora;
RoundImage roundedImage;
Bitmap bitmapa;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.list_row_horarios_liga, parent, false);
// Get the position
resultp = data.get(position);
// Locate the TextViews in listview_item.xml
jornada = (TextView) itemView.findViewById(R.id.jornada);
escudo_local = (ImageView) itemView.findViewById(R.id.icono_local);
Bitmap bitmap = ((BitmapDrawable)escudo_local.getDrawable()).getBitmap();
roundedImage = new RoundImage(bitmap);
escudo_local.setImageDrawable(roundedImage);
equipo_local = (TextView) itemView.findViewById(R.id.equipo_local);
escudo_visitante = (ImageView) itemView.findViewById(R.id.icono_visitante);
equipo_visitante = (TextView) itemView.findViewById(R.id.equipo_visitante);
dia_hora = (TextView) itemView.findViewById(R.id.dia_hora);
canal_tv = (TextView) itemView.findViewById(R.id.canal_tv);
icono_tv = (ImageView) itemView.findViewById(R.id.icono_tv);
dia_hora.setTypeface(tf);
canal_tv.setTypeface(tf);
equipo_local.setTypeface(tf_dos);
equipo_visitante.setTypeface(tf_dos);
jornada.setTypeface(tf_dos);
jornada.setText(resultp.get(ConciertosCiudad.TAG_NAME));
imageLoader.DisplayImage(resultp.get(ConciertosCiudad.TAG_MEDIUM), escudo_local);
equipo_local.setText(resultp.get(ConciertosCiudad.TAG_NAME_VENUE));
imageLoader.DisplayImage(resultp.get(ConciertosCiudad.TAG_VENUE_LOGO), escudo_visitante);
equipo_visitante.setText(resultp.get(ConciertosCiudad.TAG_COUNTRY));
dia_hora.setText(resultp.get(ConciertosCiudad.TAG_STREET));
canal_tv.setText(resultp.get(ConciertosCiudad.TAG_STARTDATE));
return itemView;
}
}
我收到此代码的错误：
Bitmap bitmap = ((BitmapDrawable)escudo_local.getDrawable()).getBitmap();
roundedImage = new RoundImage(bitmap);
escudo_local.setImageDrawable(roundedImage);
这是我的日志猫：
05-16 12:08:28.762: E/AndroidRuntime(25969): FATAL EXCEPTION: main
05-16 12:08:28.762: E/AndroidRuntime(25969): Process: my.package.feed, PID: 25969
05-16 12:08:28.762: E/AndroidRuntime(25969): java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.Bitmap android.graphics.drawable.BitmapDrawable.getBitmap()' on a null object reference
05-16 12:08:28.762: E/AndroidRuntime(25969): at my.package.feed.LazyAdapterConciertosCiudad.getView(LazyAdapterConciertosCiudad.java:77)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.AbsListView.obtainView(AbsListView.java:2346)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.ListView.measureHeightOfChildren(ListView.java:1270)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.ListView.onMeasure(ListView.java:1182)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1456)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:727)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:463)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.LinearLayout.measureVertical(LinearLayout.java:875)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:762)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
05-16 12:08:28.762: E/AndroidRuntime(25969): at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:447)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
05-16 12:08:28.762: E/AndroidRuntime(25969): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2815)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.View.measure(View.java:17429)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2001)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1166)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1372)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5786)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.Choreographer.doCallbacks(Choreographer.java:580)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.Choreographer.doFrame(Choreographer.java:550)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.os.Handler.handleCallback(Handler.java:739)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.os.Handler.dispatchMessage(Handler.java:95)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.os.Looper.loop(Looper.java:135)
05-16 12:08:28.762: E/AndroidRuntime(25969): at android.app.ActivityThread.main(ActivityThread.java:5254)
05-16 12:08:28.762: E/AndroidRuntime(25969): at java.lang.reflect.Method.invoke(Native Method)
05-16 12:08:28.762: E/AndroidRuntime(25969): at java.lang.reflect.Method.invoke(Method.java:372)
05-16 12:08:28.762: E/AndroidRuntime(25969): a
这是我的Image Loader：
public class ImageLoader {
MemoryCache memoryCache = new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews = Collections
.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
// Handler to display images in UI thread
Handler handler = new Handler();
public ImageLoader(Context context) {
fileCache = new FileCache(context);
executorService = Executors.newFixedThreadPool(5);
}
//No lo uso para nada
final int stub_id = R.drawable.ic_action_about;
public void DisplayImage(String url, ImageView imageView) {
imageViews.put(imageView, url);
Bitmap bitmap = memoryCache.get(url);
if (bitmap != null)
imageView.setImageBitmap(bitmap);
else {
queuePhoto(url, imageView);
//imageView.setImageResource(stub_id);
}
}
private void queuePhoto(String url, ImageView imageView) {
PhotoToLoad p = new PhotoToLoad(url, imageView);
executorService.submit(new PhotosLoader(p));
}
private Bitmap getBitmap(String url) {
File f = fileCache.getFile(url);
Bitmap b = decodeFile(f);
if (b != null)
return b;
// Download Images from the Internet
try {
Bitmap bitmap = null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) imageUrl
.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(true);
InputStream is = conn.getInputStream();
OutputStream os = new FileOutputStream(f);
Utils.CopyStream(is, os);
os.close();
conn.disconnect();
bitmap = decodeFile(f);
return bitmap;
} catch (Throwable ex) {
ex.printStackTrace();
if (ex instanceof OutOfMemoryError)
memoryCache.clear();
return null;
}
}
// Decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f) {
try {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
FileInputStream stream1 = new FileInputStream(f);
BitmapFactory.decodeStream(stream1, null, o);
stream1.close();
// Find the correct scale value. It should be the power of 2.
// Recommended Size 512
final int REQUIRED_SIZE = 70;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE
|| height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
FileInputStream stream2 = new FileInputStream(f);
Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2);
stream2.close();
return bitmap;
} catch (FileNotFoundException e) {
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
// Task for the queue
private class PhotoToLoad {
public String url;
public ImageView imageView;
public PhotoToLoad(String u, ImageView i) {
url = u;
imageView = i;
}
}
class PhotosLoader implements Runnable {
PhotoToLoad photoToLoad;
PhotosLoader(PhotoToLoad photoToLoad) {
this.photoToLoad = photoToLoad;
}
@Override
public void run() {
try {
if (imageViewReused(photoToLoad))
return;
Bitmap bmp = getBitmap(photoToLoad.url);
memoryCache.put(photoToLoad.url, bmp);
if (imageViewReused(photoToLoad))
return;
BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad);
handler.post(bd);
} catch (Throwable th) {
th.printStackTrace();
}
}
}
boolean imageViewReused(PhotoToLoad photoToLoad) {
String tag = imageViews.get(photoToLoad.imageView);
if (tag == null || !tag.equals(photoToLoad.url))
return true;
return false;
}
// Used to display bitmap in the UI thread
class BitmapDisplayer implements Runnable {
Bitmap bitmap;
PhotoToLoad photoToLoad;
public BitmapDisplayer(Bitmap b, PhotoToLoad p) {
bitmap = b;
photoToLoad = p;
}
public void run() {
if (imageViewReused(photoToLoad))
return;
if (bitmap != null)
photoToLoad.imageView.setImageBitmap(bitmap);
//else
//photoToLoad.imageView.setImageResource(stub_id);
}
}
public void clearCache() {
memoryCache.clear();
fileCache.clear();
}
}
有人知道为什么或我可以解决它？非常感谢你
答案 0 :(得分：1)
我建议您使用universal image loader进行图像加载，并使用圆角图像在图像加载器中使用DisplayImageOptions。
作为
DisplayImageOptions userimgoptions = new DisplayImageOptions.Builder()
.displayer(new RoundedBitmapDisplayer((int) 50.0f))
.showImageOnLoading(android.R.color.transparent)
.showImageForEmptyUri(R.drawable.picture_info_profile_img)
.showImageOnFail(R.drawable.picture_info_profile_img)
.cacheInMemory(true).cacheOnDisc(true)
.bitmapConfig(Bitmap.Config.ARGB_8888).build();
这里50.0f是半径像素。
答案 1 :(得分：0)
在escudo_local之前将getDrawable中的一些位图放在xml资源中的init或者从web加载，例如。
试用BitmapDisplayer的代码：
class BitmapDisplayer implements Runnable {
Bitmap bitmap;
PhotoToLoad photoToLoad;
public BitmapDisplayer(Bitmap b, PhotoToLoad p) {
bitmap = b;
photoToLoad = p;
}
public void run() {
if (imageViewReused(photoToLoad))
return;
if (bitmap != null)
photoToLoad.imageView.setImageDrawable(new RoundImage(bitmap));
//else
//photoToLoad.imageView.setImageResource(stub_id);
}
}
并删除
Bitmap bitmap = ((BitmapDrawable)escudo_local.getDrawable()).getBitmap();
roundedImage = new RoundImage(bitmap);
escudo_local.setImageDrawable(roundedImage);
来自适配器。